XMM-Newton Discovery of an X-Ray Filament in Coma

  • A. Finoguenov
  • U. G. Briel
  • J. P. Henry
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 309)


XMM-Newton observations of the outskirts of the Coma cluster of galaxies confirm the existence of warm X-ray gas claimed previously and provide a robust estimate of its temperature (~ 0.2 keV) and oxygen abundance (~ 0.1 solar). Associating this emission with a 20 Mpc infall region in front of Coma, seen in the skewness of its galaxy velocity distribution, yields an estimate of the density of the warm gas of ~ 50 Pcritical . Our measurements of gas mass associated with the warm emission strongly support its nonvirialized nature, suggesting that we are observing the warm-hot intergalactic medium (WHIM). Our measurements provide a direct estimate of the O, Ne and Fe abundance of the WHIM. Differences with the reported Ne/O ratio for some OVI absorbers hints to different origin of the OVI absorbers and the Coma filament.


clusters: individual: Coma cosmology: observations intergalactic medium large-scale structure 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Bonamente, M., Joy, M., Lieu, R. 2003, ApJ, in press (astro-ph/0211439)Google Scholar
  2. Briel, U.G., Henry, J.P. 1995, A&A, 302, 9ADSGoogle Scholar
  3. Briel, U.G., Henry, J.P., Lumb, D.H., Arnaud, M., Neumann, D., et al. 2001, A&A, 365, L60ADSCrossRefGoogle Scholar
  4. Cen, R., Ostriker, J.P. 1999, ApJ, 514, 1ADSCrossRefGoogle Scholar
  5. Colles, M., Dunn, A.M. 1996, ApJ, 458, 435ADSCrossRefGoogle Scholar
  6. Donnelly, R.H., Markevitch, M., Forman, W., Jones, C., Churazov, E., Gilfanov, M. 1999, ApJ, 513, 690ADSCrossRefGoogle Scholar
  7. Finoguenov, A., Reiprich T., Boehringer, H. 2001, A&A, 368, 749ADSCrossRefGoogle Scholar
  8. Finoguenov, A., Burkert, A., Boehringer, H. 2003b, ApJ, submittedGoogle Scholar
  9. Freyberg, M. J., Breitschwerdt, D. 2002, Proc. of JENAM 2002, in pressGoogle Scholar
  10. Fukugita, M., Hogan, C.J., Peebles, P.J.E. 1998, ApJ, 503, 518ADSCrossRefGoogle Scholar
  11. Huchra, J.P., Geller, M.J., Corwin, H.G.Jr.. 1995, ApJS, 99,391ADSCrossRefGoogle Scholar
  12. Lumb, D.H., Warwick, R.S., Page, M., De Luca, A. 2002, A&A, 389, 93ADSCrossRefGoogle Scholar
  13. Markevitch, M., Bautz, M.W., Biller, B., et al. 2002, ApJ, in press, (astro-ph/0209441)Google Scholar
  14. Mathur, S., Weinberg, D.H., Chen, X. 2002, ApJ, in press, astro-ph/0206121Google Scholar
  15. Nagamine, K., Fukugita, M., Cen, R., Ostriker, J.P. 2001, ApJ, 558, 497ADSCrossRefGoogle Scholar
  16. Nicastro, F., Zezas, A., Drake, J., Elvis, M., Fiore, F., Fruscione, A., Marengo, M., Mathur, S., Bianchi, S. 2002, ApJ, 573, 157ADSCrossRefGoogle Scholar
  17. Scharf, C., Donahue, M., Voit, G.M., Rosati, P., Postman, M. 2000, ApJ, 528, L73ADSCrossRefGoogle Scholar
  18. Tripp, T.M., Savage, B.D., Jenkins, E.B. 2000, ApJ, 534, L1ADSCrossRefGoogle Scholar
  19. White, S.D.M., Briel, U.G., Henry, J.P. 1993, MNRAS, 261, L8ADSGoogle Scholar
  20. Zappacosta, L., Mannucci, F., Maiolino, R., Gilli, R., Ferrara, A., Finoguenov, A., Nagar, N. M., Axon, D. J. 2002, A&A, 394, 7ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2004

Authors and Affiliations

  • A. Finoguenov
    • 1
  • U. G. Briel
    • 1
  • J. P. Henry
    • 2
  1. 1.Max-Planck-Institut fuer extraterrestrische PhysikGarchingGermany
  2. 2.Institute for AstronomyUniversity of HawaiiHonoluluUSA

Personalised recommendations